Amplifier



FIG. 1 is a front isometric view of an amplifier showing our new design.

FIG. 2 is a front elevation view thereof.

FIG. 3 is a back elevation view thereof.

FIG. 4 is a top plan view thereof.

FIG. 5 is a bottom plan view thereof the first embodiment; and,

FIG. 6 is a left side elevation view thereof. The right side elevation view is a mirror image of the left side elevation view.

Any broken lines shown in the drawings are for illustrative purposes only and form no part of the claimed design. 

We claim the ornamental design for an amplifier, as shown and described. 